cold air coming from vents when heat is off

I usually have the windows down if the AC is off so I guess I never noticed. If you want to keep cold air form coming into the cabin, press the recirc button. 3,770. We build a house 1 year ago and when the temperature gets below 50 degrees outside we start getting cold air coming through 4 vents of our house. I have never had an AC unit's fan come on if the AC/heat was turned off. The air coming from your vents is first chilly, eventually turns warm but then gets chilly again before the fan cuts off completely between heating cycles Explanation: Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. My thermostat is off, but there is air blowing from my vents. If you turn on the heating system and notice that cold air is coming out through the vents, then this shouldn’t be puzzling, especially if the system has been off for a while. During the summer, dust settles within the HVAC on the heat exchanger. There are 3 returns on the 2nd floor, and about 10 supply vents throughout both floors. My thermostat is off, but there is air blowing from my vents. My question/issue is that two of the returns and 3 of the supplies have pretty bad (cold… Nov 19 2012, 7:46pm. All vents are on the opposite side of the house than the furnace. (pressing this buttons turns on compressor) 2)Move your selector switch and see if the vents on that side blow at feet, dash, and top of glass. Sometimes, when you first turn on the heater, it can smell like gas is burning. There are exceptions. So 85-92°F feels cold to new heat pump owners. It’s only if after a few minutes and the system still continues blowing cold air that you should worry because then there is … There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. The cooling system's air handler is in my attic, and duct work was added for the 1st and second floors for cooling. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range. 8,692. Which means that they blow what ever air is selected. Most cars do not have AC vents, only climate control vents. But all you have to work with are the symptoms. Seriously? 3,770. of Energy and a few other sites had similar R value requirements, so there must be some explanation. By changing out your air filter you can help return proper airflow to the entire system. 3) turn on heat and see if it blows cold air in the vent positions mentioned above. There is … Your objection to the proposed R values sound reasonable to me. When the furnace is turned on, the dust gets burned off. CIRCULAR VENTS VS RECTANGULAR VENTS; Circular vents tend to make a lot less noise than rectangular vents. I hope this helped, Re: Air Through Vents even while ac/heat off. Villa's figures came from the U.S. Dept. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. JustinRandy131. Anyway, cold air is felt coming thru the vent. Semirhage626. JustinRandy131. Why tell this story? 1) turn off recirculate. 8,692. The colder the outside temperature gets the more air we have dropping from the vents. It was added by the dealer. Semirhage626. If the smell isn’t coming from the vents, it’s most likely a leak at a … I had a 1980 Ferrari that did not come stock with AC. You should clean or replace your air filter every 30-60 days anyway for improved HVAC efficiency and better indoor air quality. When the furnace is turned on, the dust gets burned off hope. 3 ) turn on the heat exchanger proposed R values sound reasonable to me like gas burning! Cold Air/AC Blows hot air you can help return proper airflow to the proposed R sound. 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